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/*
* s390 storage attributes device -- KVM object
*
* Copyright 2016 IBM Corp.
* Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "qemu/osdep.h"
#include "hw/boards.h"
#include "migration/qemu-file.h"
#include "hw/s390x/storage-attributes.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "exec/ram_addr.h"
#include "cpu.h"
#include "kvm_s390x.h"
Object *kvm_s390_stattrib_create(void)
{
if (kvm_enabled() &&
kvm_check_extension(kvm_state, KVM_CAP_S390_CMMA_MIGRATION)) {
return object_new(TYPE_KVM_S390_STATTRIB);
}
return NULL;
}
static void kvm_s390_stattrib_instance_init(Object *obj)
{
KVMS390StAttribState *sas = KVM_S390_STATTRIB(obj);
sas->still_dirty = 0;
}
static int kvm_s390_stattrib_read_helper(S390StAttribState *sa,
uint64_t *start_gfn,
uint32_t count,
uint8_t *values,
uint32_t flags)
{
KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
int r;
struct kvm_s390_cmma_log clog = {
.values = (uint64_t)values,
.start_gfn = *start_gfn,
.count = count,
.flags = flags,
};
r = kvm_vm_ioctl(kvm_state, KVM_S390_GET_CMMA_BITS, &clog);
if (r < 0) {
error_report("KVM_S390_GET_CMMA_BITS failed: %s", strerror(-r));
return r;
}
*start_gfn = clog.start_gfn;
sas->still_dirty = clog.remaining;
return clog.count;
}
static int kvm_s390_stattrib_get_stattr(S390StAttribState *sa,
uint64_t *start_gfn,
uint32_t count,
uint8_t *values)
{
return kvm_s390_stattrib_read_helper(sa, start_gfn, count, values, 0);
}
static int kvm_s390_stattrib_peek_stattr(S390StAttribState *sa,
uint64_t start_gfn,
uint32_t count,
uint8_t *values)
{
return kvm_s390_stattrib_read_helper(sa, &start_gfn, count, values,
KVM_S390_CMMA_PEEK);
}
static int kvm_s390_stattrib_set_stattr(S390StAttribState *sa,
uint64_t start_gfn,
uint32_t count,
uint8_t *values)
{
KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
MachineState *machine = MACHINE(qdev_get_machine());
unsigned long max = machine->maxram_size / TARGET_PAGE_SIZE;
if (start_gfn + count > max) {
error_report("Out of memory bounds when setting storage attributes");
return -1;
}
if (!sas->incoming_buffer) {
sas->incoming_buffer = g_malloc0(max);
}
memcpy(sas->incoming_buffer + start_gfn, values, count);
return 0;
}
static void kvm_s390_stattrib_synchronize(S390StAttribState *sa)
{
KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
MachineState *machine = MACHINE(qdev_get_machine());
unsigned long max = machine->maxram_size / TARGET_PAGE_SIZE;
/* We do not need to reach the maximum buffer size allowed */
unsigned long cx, len = KVM_S390_SKEYS_MAX / 2;
int r;
struct kvm_s390_cmma_log clog = {
.flags = 0,
.mask = ~0ULL,
};
if (sas->incoming_buffer) {
for (cx = 0; cx + len <= max; cx += len) {
clog.start_gfn = cx;
clog.count = len;
clog.values = (uint64_t)(sas->incoming_buffer + cx);
r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog);
if (r) {
error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r));
return;
}
}
if (cx < max) {
clog.start_gfn = cx;
clog.count = max - cx;
clog.values = (uint64_t)(sas->incoming_buffer + cx);
r = kvm_vm_ioctl(kvm_state, KVM_S390_SET_CMMA_BITS, &clog);
if (r) {
error_report("KVM_S390_SET_CMMA_BITS failed: %s", strerror(-r));
}
}
g_free(sas->incoming_buffer);
sas->incoming_buffer = NULL;
}
}
static int kvm_s390_stattrib_set_migrationmode(S390StAttribState *sa, bool val)
{
struct kvm_device_attr attr = {
.group = KVM_S390_VM_MIGRATION,
.attr = val,
.addr = 0,
};
return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
}
static long long kvm_s390_stattrib_get_dirtycount(S390StAttribState *sa)
{
KVMS390StAttribState *sas = KVM_S390_STATTRIB(sa);
uint8_t val[8];
kvm_s390_stattrib_peek_stattr(sa, 0, 1, val);
return sas->still_dirty;
}
static int kvm_s390_stattrib_get_active(S390StAttribState *sa)
{
return kvm_s390_cmma_active() && sa->migration_enabled;
}
static void kvm_s390_stattrib_class_init(ObjectClass *oc, void *data)
{
S390StAttribClass *sac = S390_STATTRIB_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
sac->get_stattr = kvm_s390_stattrib_get_stattr;
sac->peek_stattr = kvm_s390_stattrib_peek_stattr;
sac->set_stattr = kvm_s390_stattrib_set_stattr;
sac->set_migrationmode = kvm_s390_stattrib_set_migrationmode;
sac->get_dirtycount = kvm_s390_stattrib_get_dirtycount;
sac->synchronize = kvm_s390_stattrib_synchronize;
sac->get_active = kvm_s390_stattrib_get_active;
/* Reason: Can only be instantiated one time (internally) */
dc->user_creatable = false;
}
static const TypeInfo kvm_s390_stattrib_info = {
.name = TYPE_KVM_S390_STATTRIB,
.parent = TYPE_S390_STATTRIB,
.instance_init = kvm_s390_stattrib_instance_init,
.instance_size = sizeof(KVMS390StAttribState),
.class_init = kvm_s390_stattrib_class_init,
.class_size = sizeof(S390StAttribClass),
};
static void kvm_s390_stattrib_register_types(void)
{
type_register_static(&kvm_s390_stattrib_info);
}
type_init(kvm_s390_stattrib_register_types)
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